Speed-transmitting device.



v Patented Dec.

L. H. NASH.

' SPEED TRANSMITTING DEVICE.

(Applicatiun filed Jan. 10, 1899.)

(No Model.)

UNITED STATES PATENT OFFICE.

LEWIS HALLOCK NASH, OF SOUTH NORWVALK, CONNECTICUT, ASSIGNOR TO THENATIONAL METER COMPANY, OF NEW YORK, N. Y.

SPEED-TRANSMITTING DEVICE;

SPECIFICATION forming part of Letters Patent N 0. 638,668, datedDecember 5, 189.

Application filed January 10,1899. Serial No. 701,715. (No model.)

To aZZ whom it may concern.-

Be it known that I, LEwIs HALLOCK NAsH,a citizen of the United States,residing at South Not-walk, in the county of Fairfield and State ofConnecticut,have invented certain new and useful Improvements inSpeed-Transmitting Devices, of which the following is a specification.

My invention relates to speed-transmitting devices 5 and it consists ofcertain novel parts and combinations of parts pointed outin theconcluding claims.

In the accompanyingdrawingsl have shown a device embodying my inventionin the form at present preferred by me. The following is a descriptionof the device shown in the drawings; but it will be understood thatvarious modifications and changes may be made without departing from thespirit of my invention and without exceeding the scope of the claims.

Referring to the drawings, Figure 1 is a vertical view of myspeed-transmitting device. Fig. 2 is a section on the line 2 2 of Fig.1.

3 is a driving-shaft connected to a source of power. 4 is a fly-wheelkeyed to said shaft, having a rim 5, which is turned upon its insidesurface to form a friction-bearing for a friction-clutch.

6 is a driven shaft, and 7a fly-wheel keyed to said shaft. Thisfly-wheel 7 has arms or spokes which support bearing-pins 8, upon whichpins levers 9 are hinged. The outer edge of each lever carries a shoe11, which shoe bears upon the inner surface of the rim 5 of thedriving-wheel. These levers 9 are controlled, as hereinafter described,by setscrews 12, fixed to an intermediate wheel 13 and springs 14, eachhaving one end attached to a lever 9 and at the other to a lug 15 uponsaid intermediate wheel.

The intermediate wheel 13 is loosely mounted on its support, being heldin place by plate 28, and carries studs 16 16, which serve as fulcrumsfor governor-weights 17 17, controlled by springs 18 18, attached tolugs 19 19. A link 20 connects the two weights, so that they acttogether. These weights l7 carry shoes 22 22, which bear upon the innersurface of the rim 5.

The operation of the device is as follows:

Considering first the intermediate wheel 13, it will be seen that theonly means of driving the wheel are the shoes 22 in frictional contactwith the rim of the driving-wheel, and that the friction between the twois regulated by the governor-weights 17 acting in connection withsprings 18 in such a manner that when the intermediate wheel exceeds apredetermined speed centrifugal force acting on the weights 17 overcomesthe force of the springs 18 and withdraws the shoes 22 more or less fromcontact with the rim 5. The loosely-mounted intermediate wheel by itsinertia overcomes any sudden tendency to acceleration or retardation, sothat change of speed cannot be sudden, while the governor establisheswhat the normal speed shall be. Considering next the driven wheel 7, itwill be seen that the motion of the driving part is communicated to thisdriven part by the shoes 11 11 ll 11 in friction contact with the rim ofthe driving-wheel. The levers 9, to which these shoes are attached,being controlled by springs 14 and set-screws 12, attached t0 theintermediate part 13, if the intermediate part tends to go faster thanthe driven wheel it has the effect of immediately pressing the shoes 11in contact with the rim 5, and this immediately causes the wheel 7 toaccelerate its velocity until it equals the velocity of the wheel 13. Onthe other hand, if the wheel 13 tends to go slower than the wheel 7 ithas the effect of instantly diminishing or withdrawing pressure upon theshoes 11, and thus causing the velocity of the wheel 7 to diminish. Ittherefore of necessity fol lows that the wheel 7 must revolve atsubstantially the same velocity as the wheel 13. By reason of theinertia of this intermediate wheel and the fact that it transmits asmall amount of force it is easy to control it and to secure a uniformspeed without bringing upon it any severe strains. Said intermediatepart also acts as a power'multiplying device through the lever 9, bywhich a small amount of force exerted by the centrifugal mechanism 17and 18 is greatly multiplied in acting upon the friction mechanism ofthe wheel 7.

Many of the details and combinations illustrated and above described arenot essential to my several inventions, broadly considered. All thiswill be indicated in the concluding claims, where the omission of anelement or the omission of reference to the detail features of theelements mentioned is intended to be a formal declaration of the factthat the omitted elements or features are not essential to theinventions therein severally covered.

What I claim is- 1. In a speed-transmitting mechanism, the combinationof a driving part, an intermediate part loosely mounted on its supportand having a friction device bearing upon the d riving part and agovernor by means of which said friction device is controlled, a drivenpart having a friction device also bearing upon the driving part andmechanism connecting the intermediate part with the friction device ofthe driven part by means of which it is controlled.

2. In a speed-transmitting mechanism, the combination with the drivingand driven parts of an intermediate wheel loosely mounted, a governorcarried by said intermediate wheel having friction relation with thedriving part,

and a friction-clutch carried by the driven part and operated by saidintermediate part.

3. In a speed-transmitting device, the combination with the drivingpart, of an intermediate part provided with a centrifugal governor and afriction-shoe controlled by said governor and bearing upon the drivingpart and a driven part carrying a lever provided with a friction-shoe incontact with the driving part, said lever being acted upon by the powertransmitted through the intermediate part to maintain friction contactbetween the shoe of the last-mentioned part and the driving part.

at. In a speed'transmitting 1nechanisn1,the combination with the drivingpart 5, of an intermediate part 13, centrifugal governor 17, 1S, shoe22, driven part 7 carrying friction device 9 controlled by a stud 12,attached to the intermediate part.

In testimony whereof I have hereunto signed this specification.

LEWIS HALLOCK NASH. In presence of- J OHN H. NORRIS, HARRY T. WooLsoN.

